python - error at gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY

Question

When i try to apply this code, i get a problem at line six. can anyone tell me where is the problem exaclty?

import cv2
import numpy as np

img = cv2.imread('20170616_173327.jpg')

gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
gray = cv2.medianBlur(gray, 5)
edges = cv2.adaptiveThreshold(gray, 255, cv2.ADAPTIVE_THRESH_MEAN_c, cv2.THRESH_BINARY, 9, 9)
color = cv2.bilateralFilter(img, 9, 250, 250)

cartoon = cv2.bitwise_and(color, color, mask=edges)

cv2.imwrite("result.png", cartoon)
cv2.waitkey(0)
cv2.destroyAllWindows()

Answer 1

等待大神答复